N-functionalized amino-aluminium and -boron complexes: Intramolecular aromatic nitrogen-assisted formation of aminoboranes

Reaction of 6-methyl-2-bis(trimethylsilyl)pyridine or 8-bis(trimethylsilyl) aminoquinoline with BCl₃ in hexane results in facile elimination of ClSiMe₃ affording an aminodichloroborane, (2) or (5a), then a novel aminobis(dichloroborane), (3) or (6); compounds (3) and (5b), prepared from a lithium reagent and AlCl₃, have been structurally authenticated using X-ray diffraction data.